虚拟主机不能在邮递员中工作，但可以通过 CURL 访问

我正在使用可以使用本地 url 访问的 SLIM 框架：http://localhost:/

但我无法通过在浏览器或邮递员中输入网址： http ://dev.slim.com 通过虚拟主机访问它。它说：

无法访问此站点 dev.slim.com 的服务器 IP 地址无法找到。

这是我的配置文件：

<VirtualHost *:80>
# The ServerName directive sets the request scheme, hostname and port that
# the server uses to identify itself. This is used when creating
# redirection URLs. In the context of virtual hosts, the ServerName
# specifies what hostname must appear in the request's Host: header to
# match this virtual host. For the default virtual host (this file) this
# value is not decisive as it is used as a last resort host regardless.
# However, you must set it for any further virtual host explicitly.
ServerName dev.slim.com

ServerAdmin webmaster@localhost
DocumentRoot /var/www/html/api-slim/public/

<Directory /var/www/html/api-slim/public/>
    Options Indexes FollowSymLinks
    AllowOverride All
    Require all granted
</Directory>


# Available loglevels: trace8, ..., trace1, debug, info, notice, warn,
# error, crit, alert, emerg.
# It is also possible to configure the loglevel for particular
# modules, e.g.
#LogLevel info ssl:warn

ErrorLog ${APACHE_LOG_DIR}/error.log
CustomLog ${APACHE_LOG_DIR}/access.log combined

# For most configuration files from conf-available/, which are
# enabled or disabled at a global level, it is possible to
# include a line for only one particular virtual host. For example the
# following line enables the CGI configuration for this host only
# after it has been globally disabled with "a2disconf".
#Include conf-available/serve-cgi-bin.conf

但是我尝试使用 CURL 并且我从 url 中得到了一些结果，这意味着虚拟主机正在工作，但是为什么我无法在浏览器或邮递员中访问它？